Re: [QEMU PATCH v4 10/13] virtio-gpu: Resource UUID

[Albert Esteve <aesteve@redhat.com>]

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On Wed, Sep 13, 2023 at 12:34 PM Akihiko Odaki <akihiko.odaki@daynix.com>
wrote:

> On 2023/09/13 16:55, Albert Esteve wrote:
> > Hi Antonio,
> >
> > If I'm not mistaken, this patch is related with:
> > https://lists.gnu.org/archive/html/qemu-devel/2023-09/msg01853.html
> > <https://lists.gnu.org/archive/html/qemu-devel/2023-09/msg01853.html>
> > IMHO, ideally, virtio-gpu and vhost-user-gpu both, would use the
> > infrastructure from the patch I linked to store the
> > virtio objects, so that they can be later shared with other devices.
>
> I don't think such sharing is possible because the resources are
> identified by IDs that are local to the device. That also complicates
> migration.
>
> Regards,
> Akihiko Odaki
>
> Hi Akihiko,

As far as I understand, the feature to export dma-bufs from the
virtgpu was introduced as part of the virtio cross-device sharing
proposal [1]. Thus, it shall be posible. When virtgpu ASSING_UUID,
it exports and identifies the dmabuf resource, so that when the dmabuf gets
shared inside the guest (e.g., with virtio-video), we can use the assigned
UUID to find the dmabuf in the host (using the patch that I linked above),
and import it.

[1] - https://lwn.net/Articles/828988/

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